Hypoxemic Respiratory Failure.

The goal of this clinical trial is to validate the interest of a strategy adjusting the flow rate delivered under high-flow oxygen (HFO) therapy according to the lung volumes measured by a new technique, in intensive care patients with hypoxemic respiratory distress (HRD). The main question it aims to answer is: "The use of a technique of measurement of lung pulmonary with adjustement to the flow rate can make it possible to limite intubation in patients with HRD in intensive care?" The participants will be the patients admitted in intensive care for HRD with the need for treatment with HFO. This participants will be randomized in : * the arm control: treated by high flow oxygen therapy according to standard procedures. * or in the experimental arm : treated by high flow oxygen therapy with adjustement of ventilatory parametres based on lung volume measurements, obtained by the depth camera.

The goal of this clinical trial is to learn about the effects of inhaled nitric oxide on oxygenation and lung perfusion in participants with severe obesity who have acute hypoxemic respiratory failure and are on mechanical ventilation The main questions it aims to answer are: 1. In acute hypoxemic respiratory failure, what are the effects of inhaled nitric oxide on oxygenation in participants with severe obesity compared to participants with normal body weight. 2. In acute hypoxemic respiratory failure, what are the effects of inhaled nitric oxide on lung perfusion and heart function in participants with severe obesity compared to participants with normal body weight. 3. In acute hypoxemic respiratory failure, does severe obesity impact nitric oxide signaling pathways? Participants with acute hypoxemic respiratory failure will be exposed to inhaled nitric oxide (20 ppm) while being clinically monitored.

This pilot randomized clinical trial compares dopamine and norepinephrine as first-line vasoactive therapies in term and late preterm neonates with pulmonary hypertension associated with hypoxemic respiratory failure and systemic hypotension. Systemic hypotension is a common and clinically significant complication of persistent pulmonary hypertension of the newborn (PPHN) and frequently requires vasopressor support to maintain adequate systemic perfusion. Dopamine is commonly used in this setting; however, prior animal experimental and clinical data suggest it may increase pulmonary vascular resistance, potentially worsening right ventricular afterload and hypoxemia. Norepinephrine may preferentially increase systemic vascular resistance with less effect on the pulmonary circulation. This study evaluates short-term hemodynamic and oxygenation responses following initiation of dopamine or norepinephrine.

Multicenter, open label, three-arm randomized trial to assess the effect of helmet noninvasive ventilation vs. helmet continuous positive airway pressure vs. high-flow nasal oxygen on the rate of endotracheal intubation of patients with acute moderate-to-severe hypoxemic respiratory failure

The goal of this observational study is to assess the potential non-invasive tools (e.g. regional ventilation, respiratory muscle response, lung mechanic's parameters) to identify the risk of failure when using high flow nasal cannula (HFNC) or non-invasive ventilation (NIV). The main question, it aims to answer is: Does abnormal regional ventilation could predict HFNC or NIV failure?